Refactor into more modular architecture

physics.h

@@ -0,0 +1,31 @@
+#ifndef PHYSICS_H
+#define PHYSICS_H
+
+#include "maths.h"
+
+typedef struct {
+	vec2_t pos;
+	mat2_t dir;
+	vec2_t vel;
+	float rot;
+	float mass;
+} physics_t;
+
+typedef struct {
+	float dist, va, vb;
+	vec2_t norm;
+} physics_sep_t;
+
+void physics_init();
+void physics_update();
+
+void physics_add(
+    unsigned entity, vec2_t pos, mat2_t dir, vec2_t vel, float rot,
+    float mass);
+physics_t *physics_get(unsigned entity);
+
+void physics_escape(unsigned entity);
+physics_sep_t physics_separation(unsigned a, unsigned b);
+void physics_bounce(unsigned a, unsigned b, physics_sep_t sep);
+
+#endif